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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487deed7d34ced759cf719d0567fe0f7f3b7fdf80b1a86f66d4ed9e23e70c284' 
  AND token = 'TYkP6n++3KzAtVLDCOBACnER/laSXeLmmiciFVYgsYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}